eventually i found a solution to use my c550 with the computer properly. 1. download two files, http://www.motclub.com/down/driver/P2K_driver_ 2.3.zip and http://www.motclub.com/down/driver/Motorola_USB_­Modem_Driver.zip , when isntalled use your mini usb cable with c550, and try one of the two program files with the driver search, one of em will work, after first driver is finished it will ask for another, keep trying those two directories, you put the 2 files in. then after like 20 different driver adds, it will work, then use the exe file in p2k. there you go, you can no upload and download files from your phone :D

A big shit! Terrible voice quality, with echo-effect. Standard pack does not include software and data USB cable. Low quality buttons and cover. Phone hangs up at least every 1 week, difficult to remove battery to recover the phone.